Watson-Marlow MR 160 - Manual (Page 14)

N:\Konstruktion\Betriebsanleitungen\AKTUELL\MR Serie\TDE MR160.doc Revision 4 January 13 14
Error Cause Remedy
Pump has blocked
Foreign body in the pump Remove foreign body, examine
pump for damage
Power supply interrupted Check electrical installations
(fuses), check drive
Defect on the drive (Separate the coupling and turn
the pump by hand)
Strong wear after short
operating time
Solids in the pumped material
Pumped material is abrasive Frequent change of the wearing
parts, change material pairing
Choose larger pump,
reduce speed
Rotor has wear on one side
Rotor not tightened correctly on
installation Tighten closing nut firmly on
block
Adjusting dimensions changed after
working on the bearing block Check and correct the adjusting
dimensions
MR 160 = 35.6mm +0.1
Pump not clean after CIP
cleaning
Cleaning regulation not complied
with Choke on the pressure side
Check differential pressure 3-4
bar
Rotor has seized on Liners
Rotor not correctly tightened Tighten closing nut firmly on
block
Temperature too high
(thermal expansion) Choose Liners with larger
tolerances
Purging between housing
and bearing block leaking
O-ring in the bearing block missing
or defective Install or replace O-ring
Water or pumped material
in the bearing block
Purging pressure too high Purging must be pressureless
(attach pressure reducer, max.
0.1 bar)
Leakage bores closed Check leakage bores for free
passage, replace shaft seals on
pump and bearing block
Front bearing has seized on
rotor
O-ring in the front bearing missing
or worn Install or replace O-ring
Front bearing wrongly installed Examine front bearing for
damage and install in correct
position